# Energy efficiency in Abruzzo residential buildings > Live situation record from CLSTR: https://clstr.news/situations/energy-efficiency-in-abruzzo-residential-buildings > Updated: 2026-09-21T08:15:21.000Z. Sources: 13. Developments: 2. Energy efficiency initiatives and assessments are underway in the Abruzzo region of Italy. In Sulmona, renovation works have begun on three Ater della provincia dell’Aquila residential buildings on via XXV Aprile. This project, valued at approximately 1.48 million euros and funded by the ‘Fondo per lo sviluppo e la coesione’, aims to improve inhabitant comfort and reduce thermal dispersion through insulation and the replacement of window frames, shutters, and blinds. Broader regional data from the SIAPE information system highlights a significant need for such interventions. In 2025, nearly 47% of the approximately 29,275 Energy Performance Certificates (APE) issued in Abruzzo fell into the lowest efficiency classes, F and G. Provinces such as L’Aquila and Chieti reported the highest incidence of these low-efficiency buildings, at 54% and 50% respectively, while only about 12% of regional certificates belonged to the highest efficiency classes. ## Timeline ### 2026-09-21: Abruzzo energy efficiency: nearly half of buildings in lowest classes Nearly 47% of buildings in Abruzzo, Italy, fall into the lowest energy efficiency classes (F and G), according to SIAPE data, highlighting a significant need for energy requalification. 5 sources. https://clstr.news/cluster/abruzzo-energy-efficiency-nearly-half-of-buildings-in-lowest-classes ### 2026-09-17: Sulmona: Energy efficiency works begin on Ater residential buildings Energy efficiency upgrades are underway for three Ater-owned residential buildings in Sulmona, Italy, involving 31 housing units. 8 sources. https://clstr.news/cluster/sulmona-energy-efficiency-works-begin-on-ater-residential-buildings --- Cite as: Energy efficiency in Abruzzo residential buildings. CLSTR, https://clstr.news/situations/energy-efficiency-in-abruzzo-residential-buildings